My sister has IBM Thinkpad T60 which had 'fan error' problem. Probably means the fan stopped working because i blew the dust out so it couldn't block it. Then i bought a complete heatsink+fan which are working 100% (tested) and it still won't work, the fan won't spin at all. Could it be the motherboard? I even tried to give a little help to the fan to spin but still not working.